Improvement in springs for railroad cars



tbtted CStates JAMES F.v BABCOCK, OF BOSTON, MASSACHUSETTS.

Lettere Patent No. 101,080, dated March 22,4 1870.

IMPROVEMENT IN SPRINGS PQR RAILROAD CARS.

The Schedule referred to in these Letters Patent and making part of the same.

To (all whom -t may concer-n f Be it known that I, JAMES F. BABcocK, of Boston, in the count-y of Suli'olk and State of Massachusetts, have iuvented an Improvement iu Springs for Railroad Cars audother Vehicles, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings making a part ot' this specification, in which- Figures 1 and 2 are vertical sections through springs constructed in accordance wit-h my invention.

I The object of my invention is to furnish a spring similar to the rubber springs now in use for cars and heavy vehicles, at a much less cost; and

.My invention consists in substituting cork, chemically prepared, fora portion of the rubber used for such purposes.

rlo enable others skilled 'in the art to understand' and use my invention, l will proceed to describe the manner in which I hare carried it out.

Cork is saturated with glyeerine and heated to a temperature of 2500 to 300O Fahrenheit. After this whole covered with rubber mixed with the proportion of sulphur for'vulcanizing, to produce the ordinary elastic rubber as prepared for car-springs, Sec.

The whole is then put into the mold, pressed, and then vulcanized in the usual manner. The cork, by this treatment, becomes highly elastic, while the rubber binds it together, forming a compact and substantial spring of great and permanent elasticity.

Cork in tine cuttings, as seen iin tig. 2, may be treated with glyceriue and mixed with the rubber and sulphur, and the whole vulcanized.

Other forms and arrangements of cork may be used if desired.

Claim.

What I claim as my invention, and desire to secure by Letters Patent, is

The combination of cork, when chemically treated with glycerincfor itsequivaleut, with rubber, for the purpose specified.

fit-ness my hand this 5th day of February, A. D, 1870.

JAS. F. BABCOCK. Witnesses:

JAS. B. Rous, H. l). Moin. 

